Tuesday, March 25, 2014
Where Is the MAF on a 1989 Mustang
Midway through the 1964 model year, Ford released the first of the "pony cars," the Mustang. The release of this vehicle prompted Chevrolet to follow suit in 1967 with the release of the Camaro. In the late-1980s the Mustang began using more electronic components to control the engine. One of these components is the mass air flow sensor, which is commonly called the MAF sensor.
Location
Both the 5.0-liter and the 2.3-liter Mustangs had the same location for the mass air flow sensor, about halfway between the air box and the engine on the air intake tube. It is a metal cylinder with a wiring harness plugging into it.
Tools
The mass air flow sensor attached to the air intake tube by a simple hose clamp. Depending on the style of hose clamp, either a ratchet and socket, flathead screwdriver or Phillips screwdriver will be all you need to replace it. To properly test a mass airflow sensor, use a digital volt/ohm meter.
Function
The mass air flow sensor works by using a hot ire sensing unit to measure the temperature of the air coming into the engine and a cold wire to sense the ambient temperature. The air passing over the heated wire causes it to cool. The mass air flow sensor then compares the temperature of the cold wire to the heated wire and sends that information to the vehicles computer. The computer uses that information to determine the air-to-fuel ratio in the combustion chamber.
Cleaning
On occasion the hot and cold wires are simply dirty and cannot take proper readings. When this occurs, you can clean the wires with parts cleaner to restore them to their proper operating condition. Use caution not to damage the wires though.
Testing
Check that the voltage getting to the mass air flow sensor is at least 10.5 volts. To test the sensor operation, you must check the voltage at the vehicles computer. The sensor should read approximately: .60 volts at idle, 1.10 volts at 20 mph, 1.70 volts at 40 mph and 2.10 volts at 60 mph.
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